Photocatalytic Degradation of 2-Propanol and Phenol Using Au Loaded MnWO4 Nanorod Under Visible Light Irradiation

Abstract

Single crystalline MnWO 4 nanorod has been prepared by low temperature hydrothermal reaction at 180°C. The prepared MnWO 4 possesses band gap of 2.63 eV. Photochemical decomposition method has been followed to disperse Au nanoparticles onto MnWO 4 nanorod. The prepared Au loaded MnWO 4 nanorod demonstrated greatly enhanced photocatalytic activity in decomposing 2-propanol and evolving CO 2 in gas phase and phenol in aqueous phase compared to bare MnWO 4 and commercial TiO 2 nanoparticles (Degussa P25) under visible light (k C 420 nm) irradiation. The Au loading was optimized to 3.79 wt% for the highest efficiency. The enhanced photocatalytic activity originates from the absorption of visible light by MnWO 4 as well as the introduction of nanoparticulate Au on the surface of MnWO 4 as cocatalyst to impede the recombination of photogenerated charge-carriers.

CdS decorated MnWO4 nanorod nanoheterostructures: a new 0D–1D hybrid system for enhanced photocatalytic hydrogen production under natural sunlight

“…Moreover, electrons in the conduction band (CB) of MnWO4 (+ 0.4 eV NHE) cannot reduce O2 via single-electron processes, which greatly limit the photocatalytic performance of MnWO4. 21,22 Therefore, the photocatalytic activity of MnWO4 needs to be improved further to use in practical applications. In the past, immense work has been done in the synthesis of heterojunctions wherein one photocatalyst is coupled with another catalyst is significantly beneficial to enhance the photocatalytic activities.…”

Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review

“…In another study, Au NPs were utilized to construct Schottky barriers in an MWO 4 -based system. For instance, Au NRs/MnWO 4 , with a diameter of 20-40 nm, was reported by Chakraborty et al [ 132 ] to enhance the photocatalytic decomposition of 2-propanol and phenol. The Au NPs as co-catalysts in the Au/MnWO 4 hybrid were beneficial to multi-electron O 2 reduction and hole oxidation.…”

Sorption of dyes and Cu(ii) ions from wastewater by sonochemically synthesized MnWO4 and MnMoO4 nanostructures

“…27,28 Nanostructures of MnWO 4 /MnMoO 4 have been obtained by hydro/solvothermal, combustion and microwave-assisted techniques since they have the advantage of low synthetic temperature. [29][30][31][32] In this manuscript, we report the synthesis of nanocrystalline MnWO 4 /MnMoO 4 by sonochemical method. Sonochemical synthesis is based on acoustic cavitation resulting from the continuous formation, growth and implosive collapse of the bubbles in a liquid.…”